A user at the Smartphone Thoughts forum has posted a link to a leaked version of the Windows Mobile 6 ROM for the Samsung BlackJack. Samsung and AT&T have had no official announcment or release of the update but they must be working on it because the leaked version of the ROM is getting positive reviews from its users.

This one is definitely a proceed at your own risk. The new ROM update has AT&T branding so your Cingular branding will disappear once you install it.